0: kd> !devstack ffff850a4793a570
!DevObj !DrvObj !DevExt ObjectName
ffff850a4a7ec030 \Driver\nvlddmkm ffff850a4a7ec180 InfoMask field not found for _OBJECT_HEADER at ffff850a4a7ec000
ffff850a47927e00 \Driver\ACPI ffff850a47864400 InfoMask field not found for _OBJECT_HEADER at ffff850a47927dd0
> ffff850a4793a570 \Driver\pci ffff850a4793a6c0 Cannot read info offset from nt!ObpInfoMaskToOffset
!DevNode ffff850a4793c7a0 :
DeviceInst is "PCI\VEN_10DE&DEV_134F&SUBSYS_1139152D&REV_A2\4&7efc407&0&00E0"
ServiceName is "nvlddmkm"